Molding-flask.



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CHARLES 1). SMITH, 0F DAYTON, OHIO.

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Specification of Letters Patent.

Patented Feb. 8, 1910.

Application filed November 22, 1909. Serial No. 529,291.

and useful Improvements in "Molding- Flasks; and I do declare thefollowing to be a full, clear, and exact description of the invent-ion,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the letters and figures of reference marked thereon, which form apart of this specification.

This invention relates to improvements in molding flasks, and morespecifically to the sand stri which lies between the cope and dragsections of the mold'and the means for operating said sand strip as willhereinafter be more particularly described.

The object of'the invention is to provide in a molders flask, convenientmeans which enable the sand stri to be slid outwardly in removing theflask 120m the mold and by the same grip which seizes the flask in themovement of the same.

With these and other objects in view, which willgreadily appear in thedescription, reference is made to the accompanying drawings of which Fiure 1 is a pers ective view of a molding ask constructe in accordancewith my invention. Fig. 2 is a bottom view in perspective 0f the copeportion of the flash with the slidable sand bars. Fig. 3 is a sectionalview on the line a-a of Fig. 1. Fig. 4 is a section on line bb ofFi 1.

In the accompanying drawings the flask is shown comprising the lowerportion or drag 1 and the upper portion or cope 2, the latter portionmatching in shape and size the dra portion and completing the flask. Itwill %e and 'in a tapering shape from bottom to top. It is desirable totaper the two parts of the flask from bottom to top in.order to ends ofsaid slots 7 understood that the flask may be made of any material foundmost suitable,

section 2, as sliding sand bars5 which are provided with diagonallyextending cam slots 7 which taper downwardly from their =upper surfaces.These sand bars when intheir inner position asin Fig. 2, extend inwardlyfrom the inner margin of the cope section as is clearly shown in Fig. 3.Extending into and through the tapered diagonal s ots 7, are a series oftapered guide pins 9 which rigidly extend from the bottom edges of theside and ends of the cope 2.

The lengths of these guide pins 9 are greater.

than the thickness of the sand bars Owing to this, said tapered pinsengage the top edges of the drag portion 1 and provide a clearancebetween-the sand bars and the drag, and prevent the sand bars 5 fromundue friction in their movement. In order to prevent the slots 7 in thesand bar clogging up and thus interfering withya free movement thereof,openings 7 arev provided in the top ledge of the drag 1. These openingslieon the outer sides of the guide pins 9, immediately below the outeras clearly shown in Fig. 4.

Extending from the ends of the two sections forming the sand bar areapertured projections 8 which are adapted to receive the end of thelever 10. There is one of these levers located at each end of the flaskupon pins 11 which rigidly extend from the outer sides of the ends ofthe cope section of the flask. The upper portion of. each of said leversis enlar ed as at 12, to provide a convenient place or the hand oftheoperator to grip in turning said levers on their fulcrums to move outthe sand bars 5 in freeing the flask from the mold. Surrounding each ofthe fulcrum pins 11 is a spring 13, one end of which is inserted andmade fast in the' end of the cope and the other end of which is insertedand made fast in the lever 10. The effect of these springs is tomaintain the sand bars 5 in their inner positions, as

in Fig. 2, whenever pressure is released from lifts the entire flaskfrom the mold. After the pressure is released from the levers 10 at eachend of the flask, the springs 13 throw the sand bar 5 to its normalposition. When it is desired to lift the cope section of the flask, asin removing the pattern, the operating levers 10 are not actuated, thesand her being moved with the cope While in its normal position.

It Will be understood that when the sand bars are drawn outwardly totheir limit, the entire body of sand is prevented from being retained inthe flask, and owing to the tapered form of the flask its removal isfacilitated.

Having described my invention, 1 claim:

In a molding flask, the combination with the cope and drag portionsthereof, of sand bars mounted between the adjacent edges of said copeanddrag, said sand bars having a series of diagonal slots in the bodytheresashes of, and apertured extensions on the end portrons thereof,tapered guide pins extendin from the cope and through the diagona slotsin the sand bars, said tapered guide pins be ng of a dgreater lengththan the thickness of the san bars in order that said sand bars may befree from contact with the drag portion. of the mold, operating leversfor the sand bars fulcrumed on the ends of the cope and projected intothe apertured extensions of the sand bars, and springs exerting a normalpressure on said levers to maintain the sand bars in their normalposition. in testimony whereof I afiix my signature, in presence of twoWitnesses.

CHARLES D. SMITH. Witnesses:

MATTHEW SIEBLER, HOWARD S. SMITH.

